摻鉺光纖放大器的應用

Abstract

為了確保WDM系統的傳輸品質，WDM系統中使用的光纖放大器除了具備有足夠的帶寬、高輸出功率和低噪聲系數的等特性外，隨著多通道(>80 ch)、高速率(>40 Gb/s)、長距離光纖傳輸系統的發展，對光纖放大器的增益平坦控制技術提出了更高的要求，這就需要研制動態增益可調技術。 本論文第一部份針對動態增益平坦技術提出了以Fabry-Perot 雷射融入摻鉺光纖放大器架構，以多波長注入來同時達到動態增益平坦化與增益箝制的效果。經過實驗證明，無論輸入訊號的增益位準如何改變，藉由本方法皆可得到良好的平坦化結果(≤2 dB)。而在本論文第二部份，我們利用增益箝制的特性發展出一架構。在此架構中，我們可藉由增益曲線斜率的掃描，來對光通訊網路中的訊號進行功率監測。實驗所得結果，誤差值最大約為0.8 dB左右。

In order to ensure the transmission quality of WDM systems, the optical amplifier used in WDM system should have properties such as wide bandwith, high output power and low noise figure. However, with the development of long-haul fiber transmission system, the gain-flattening technique should also be upgraded. So dynamic gain flattening technique is needed. In the first part of the thesis, we use a Fabry-Perot laser diode integrated into an erbium-doped fiber amplifier structure. By multi-wavelength injection, dynamic gain flattening and gain clamping can be simultaneously achieved. The experimental results show a good performance, in which the flatness can be less than 2 dB in the range of 1530~1560 nm. As for the second part, we take advantage of the properties of gain clamping and develop a new structure. In this structure, we can monitor the power of each channel in fiber communication networks by scanning the slope of gain curve. From the experimental results, the maximum inaccuracy is about 0.8 dB.